This paper deals with different concepts of income elasticities of demand for a heterogenous population and the relationship between individual and aggregate elasticities is analyzed. In general, the aggregate elasticity is not equal to the mean of individual elasticities. The difference depends...

The Handbook of Mathematical Economics aims to provide a definitive source, reference, and teaching supplement for the field of mathematical economics. It surveys, as of the late 1970's the state of the art of mathematical economics. This is a constantly developing field and all authors were...

The note shows that the following features of a consumption sector tends to enforce the "Law of Demand": The statistical Engelcurves "bend slowly" and there is sufficiently "dispersion" in the distribution of income.

The authors consider an economy with pure factors of production, private ownership of endowments, and constant returns to scale in production. Typically in such an economy, the weak axiom of revealed preference for market demand does not hold. The main reason for this is that the income...